Implement CRUD operations

app/controllers/articles_controller.rb

@@ -0,0 +1,107 @@
+class ArticlesController < ApplicationController
+
+  # get / or /articles.
+  # Fetches articles based on search parameters and assigns them to an instance variable.
+  #
+  # @return [void]
+  def index
+    @articles = if params[:search] # search if search there's a search parameter
+                  Article.search(params[:search])
+                else
+                  # return all articles
+                  Article.all
+                end
+  end
+
+  # get /articles/new.
+  # Assigns a new instance of Article to an instance variable.
+  #
+  # @return [void]
+  def new
+    @article = Article.new
+  end
+
+  # post /articles.
+  # Creates a new article.
+  #
+  # @return [void]
+  def create
+    @article = Article.new(article_params)
+
+    # redirect to article if saved successfully
+    if @article.save
+      redirect_to @article
+    else
+      # if there's an error return to new post page with unprocessable entity status
+      render :new, status: :unprocessable_entity
+    end
+  end
+
+  # get /articles/:id.
+  # Fetches and assigns an article to an instance variable.
+  #
+  # @param :id [Integer] article ID
+  #
+  # @return [void]
+  def show
+    @article = Article.find(params[:id])
+  end
+
+  # get /articles/:id/edit.
+  # Fetches and assigns an article to an instance variable for editing.
+  #
+  # @param :id [Integer] The ID of the article to edit.
+  #
+  # @return [void]
+  def edit
+    @article = Article.find(params[:id])
+  end
+
+  # put or patch /articles/:id.
+  # Update an article.
+  #
+  # Updates an article with the specified ID using the given parameters.
+  # If the update is successful, redirects to the updated article.
+  # If the update fails, renders the edit template with an error status.
+  #
+  # @param :id [Integer] The ID of the article to update.
+  # @param :article_params [ActionController::Parameters] The parameters to update the article from form input.
+  #
+  # @return [void]
+  def update
+    @article = Article.find(params[:id])
+
+    # if update is completed, redirect
+    if @article.update(article_params)
+      redirect_to @article
+    else
+      # if there's a processing error, return to edit with unprocessable entity code.
+      render :edit, status: :unprocessable_entity
+    end
+  end
+
+  # delete /articles/:id.
+  # Destroys an article and redirects to the root path.
+  #
+  # @param :id [Integer] ID of article to delete.
+  #
+  # @return [void]
+  def destroy
+    @article = Article.find(params[:id])
+    @article.destroy
+
+    redirect_to root_path, status: :see_other # redirect to root path with error code 303
+  end
+
+  private
+
+  # Strong parameters method for filtering and permitting article parameters.
+  #
+  # @return [ActionController::Parameters] parameters object with the filtered and permitted parameters.
+  #
+  def article_params
+    # filters parameters based on type so data works with model
+    params.require(:article).permit(:title, :content, :author, :date)
+
+  end
+end

app/helpers/articles_helper.rb

@@ -0,0 +1,2 @@
+module ArticlesHelper
+end

app/models/article.rb

@@ -0,0 +1,21 @@
+class Article < ApplicationRecord
+  before_validation :default_values # check if default values are required before validation
+  validates :title, :content, :author, :date, presence: true # require all fields
+
+  # Sets author to 'Anonymous' if it is not already set
+  def default_values
+    unless self.author?
+      self.author = 'Anonymous' # set author to 'Anonymous' if not set
+    end
+    self.date ||= Date.today # if date is nil set to Date.today
+  end
+
+  # Searches for articles that have a matching title or content.
+  #
+  # @param search [String] The search query.
+  # @return [ActiveRecord::Relation<Article>] An ActiveRecord relation of articles that match the search query.
+  def self.search(search)
+    where("title LIKE ? or content LIKE ?", "%#{search}%", "%#{search}%")
+  end
+
+end

app/views/articles/_form.html.erb

@@ -0,0 +1,31 @@
+<%= form_with model: @article do |form| %>
+  <div>
+    <%= form.label :title %><br>
+    <%= form.text_field :title %>
+    <%= @article.errors.full_messages_for(:title).each do |message| %>
+      <div><%= message %></div>
+    <% end %>
+  </div>
+
+  <div>
+    <%= form.label :content %><br>
+    <%= form.text_area :content %>
+    <%= @article.errors.full_messages_for(:content).each do |message| %>
+      <div><%= message %></div>
+    <% end %>
+  </div>
+
+  <div>
+    <%= form.label :author %><br>
+    <%= form.text_field :author %>
+  </div>
+
+  <div>
+    <%= form.label :date %><br>
+    <%= form.text_field :date %>
+  </div>
+
+  <div>
+    <%= form.submit %>
+  </div>
+<% end %>

app/views/articles/destroy.html.erb

@@ -0,0 +1,2 @@
+<h1>Articles#destroy</h1>
+<p>Find me in app/views/articles/destroy.html.erb</p>

app/views/articles/edit.html.erb

@@ -0,0 +1,2 @@
+<h1>Edit <%= @article.title %></h1>
+<%= render "form", article: @article %>

app/views/articles/index.html.erb

@@ -0,0 +1,15 @@
+<h1>Articles</h1>
+<%= form_with(url: articles_path, method: "get") do %>
+  <%= text_field_tag :search, params[:search] %>
+  <%= submit_tag "Search" %>
+<% end %>
+<ul>
+  <% @articles.each do |article| %>
+    <li>
+      <a href="<%= article_path(article) %>">
+        <%= article.title %>
+      </a>
+    </li>
+  <% end %>
+</ul>
+<%= link_to "Create New Article", new_article_path %>

app/views/articles/new.html.erb

@@ -0,0 +1,2 @@
+<h1>New Article</h1>
+<%= render "form", article: @article %>

app/views/articles/show.html.erb

@@ -0,0 +1,10 @@
+<h1><%= @article.title %></h1>
+<h3><%= @article.author %></h3>
+<h4><%= @article.date %></h4>
+<p><%= @article.content %></p>
+
+<%= link_to "Edit", edit_article_path(@article) %> <br>
+<%= link_to "Destroy", article_path(@article), data: {
+  turbo_method: :delete,
+  turbo_confirm: "Are you sure?"
+} %>

config/routes.rb

@@ -1,10 +1,4 @@
 Rails.application.routes.draw do
-  # Define your application routes per the DSL in https://guides.rubyonrails.org/routing.html
-
-  # Reveal health status on /up that returns 200 if the app boots with no exceptions, otherwise 500.
-  # Can be used by load balancers and uptime monitors to verify that the app is live.
-  get "up" => "rails/health#show", as: :rails_health_check
-
-  # Defines the root path route ("/")
-  # root "posts#index"
+  root "articles#index" # set root to direct to index method of articles_controller
+  resources :articles # sets up routes for articles automatically
 end

db/migrate/20240129234034_create_articles.rb

@@ -0,0 +1,12 @@
+class CreateArticles < ActiveRecord::Migration[7.1]
+  def change
+    create_table :articles do |t|
+      t.string :title
+      t.string :content
+      t.string :author
+      t.date :date
+
+      t.timestamps
+    end
+  end
+end

db/migrate/20240129235228_change_content_to_text.rb

@@ -0,0 +1,6 @@
+class ChangeContentToText < ActiveRecord::Migration[7.1]
+  def change
+    change_column :articles,
+                  :content, :text
+  end
+end

test/fixtures/articles.yml

@@ -0,0 +1,13 @@
+# Read about fixtures at https://api.rubyonrails.org/classes/ActiveRecord/FixtureSet.html
+
+one:
+  title: MyString
+  content: MyString
+  author: MyString
+  date: 2024-01-29
+
+two:
+  title: MyString
+  content: MyString
+  author: MyString
+  date: 2024-01-29

test/models/article_test.rb

@@ -1,6 +1,11 @@
 require 'test_helper'
 
 class ArticleTest < ActiveSupport::TestCase
+
+  setup do
+    Article.delete_all
+  end
+
   test 'starts with no articles' do
     assert_equal 0, Article.count
   end